Given that Magical Poison Dart is one of the most powerful spells in Earth's repertoire, I am not sure why we should get rid of it.
Much as I enjoy basic spells such as "poison dart" would imply, in the current iteration of balance, all poison spells are pretty much broken and the spell itself becomes anything but basic.
Nevermind the facts that the lowest rank spell shouldn't be "the most powerful", or that poison related spells should just get a school of their own instead of being thrown into earth for vaguely thematic reasons.
